Dean has a coupon for 15% off his total purchase price at his favorite store. Let x represent the original purchase price in dollars. Tell whether you can use each proportion or equation below to find the discount amount, the final purchase price, or neither.

false

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during a tunnel construction project, engineers used explosives to excavate partway into a mountain. but due to constraints and environmental concerns, they later introduced a tunnel boring machine (tbm) to excavate the rest of the tunnel. the length and of the completed tunnel (in feet) is based on the number of days since the tbm started working. the length can be calculated using the equation y = 25x + 225. what does the y-intercept represent in this scenario?